是什么意思？ *递归*” print_r 输出是什么意思？
我使用此递归代码来读取另一个目录中的所有目录，并将它们存储在父目录中。
protected function readDirs($parent)
{
$currentDir = $parent->source();
$items = scandir($currentDir);
foreach ($items as $itemName)
{
if (Dir::isIgnorable($itemName) )
continue;
$itemPath = $currentDir.SLASH.$itemName;
if (! is_dir($itemPath) )
continue;
$item = new ChangeItem(TYPE_DIR);
$item->parent($parent)->source($itemPath);
$parent->children[ $itemName ] = $item;
$this->readDirs($item);
}
}
完成此操作后，如果我对存储其他所有内容的全局对象执行 print_r() ，对于某些项目，它会说：
[parent:protected] => ChangeItem Object
*RECURSION*
这是什么意思？我是否能够访问父对象？
I'm using this recursive code to read all directories inside another directory, and store them within the parent directory.
protected function readDirs($parent)
{
$currentDir = $parent->source();
$items = scandir($currentDir);
foreach ($items as $itemName)
{
if (Dir::isIgnorable($itemName) )
continue;
$itemPath = $currentDir.SLASH.$itemName;
if (! is_dir($itemPath) )
continue;
$item = new ChangeItem(TYPE_DIR);
$item->parent($parent)->source($itemPath);
$parent->children[ $itemName ] = $item;
$this->readDirs($item);
}
}
After this is done, if I do a print_r() on the global Object which is storing everything else, for some of the items it says:
[parent:protected] => ChangeItem Object
*RECURSION*
What does that mean? Will I be able to access the parent object or not?
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这意味着该属性是对已被
print_r访问过的对象的引用。print_r检测到这一点并且不会继续沿该路径前进；否则，结果输出将是无限长的。在程序的上下文中，
scandir还会返回对当前目录和父目录的引用（分别名为.和..），如下它们会导致递归。遵循符号链接也可能导致递归。It means that the property is a reference to an object that has already been visited by
print_r.print_rdetects this and doesn't continue down that path; otherwise, the resulting output would be infinitely long.In the context of your program, as
scandiralso returns references to the current and parent directories (named.and.., respectively), following them would lead to recursion. Following symbolic links may also cause recursion.scandir返回.条目，它代表当前目录。然后，您将该目录存储在其父目录（本身）中。于是，递归。我建议忽略
.和..。您收到的“RECURSION”消息意味着数据结构无法完整打印，因为它是无限的。
scandirreturns the.entry, which represents the current directory. You then go to store this directory inside its parent (itself). Thus, recursion.I suggest ignoring
.and...The "RECURSION" message you got means the data structure cannot be printed in its entirety because it would be infinite.